Tunnel doors help increase the productivity of your building. Replace the inefficient tunnel curtains with the tunnel doors from Munters. These high performance, low maintenance and easy installation doors are the alternative to tunnel curtains. The 1 inch expanded polystyrene foam baffle is protected on top and bottom by black corrugated polypropylene sheets which gives a thermal insulation advantage over the industry standard of foam and plastic sheets. The steel lift brackets coupled with stiffeners keep the doors uniform in opening and closing.